At least six people were killed and more than 50 injured on Saturday morning when a traffic accident in east of Pakistan. According to the rescue sources, two speedy passenger buses collided. The buses were Lahore and Dera Ismail Khan bounded. Four passengers died on the spot while two others succumbed to injuries at hospitals. Rescue teams reached at the scene soon after the accident and shifted injured people to hospitals. Sources said that ten injured people were in a critical condition, authorities said.